What is 18.21333... as a Fraction?

18.213 equals 136675 as a fraction.

How do you turn 18.213 repeating into a fraction?

Detailed Answer:

Step 1: To convert 18.213 repeating into a fraction, begin writing this simple equation:

n = 18.213 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (3) and 2 digits in the non-repeating part (21). Multiply both sides by 10³ = 1000.

1000 × n = 18213.3 (equation 2)

Step 3: Now subtract equation 1 from equation 2 to cancel the repeating block (or repetend) out.

1000 × n = 18213.3
 100 × n = 18.213
 900 × n = 16392

16392900 could be the answer, but it still can be put in the simplest form, i.e., reduced.

To simplify this fraction, divide the numerator and denominator by 12 (the GCF - greatest common factor).

n = 16392900 = 16392 ÷ 12900 ÷ 12 = 136675. So,

18.213 = 136675 as the lowest possible fraction.

As the numerator is greater than the denominator, we have an improper fraction, so we can also express it as a mixed number, thus 136675 is also equal to 181675 when expressed as a mixed number.

The repeating decimal 18.213 (vinculum notation) has a repeated block length of 1. It is also represented as 18.21333... (ellipsis notation) which equals approximately 18.2133333 (decimal approximation)(*).

The recurring decimal 18.213 can be written as a ratio of two integers having 1366 as the numerator and 75 as the denominator. So, it is a rational number (named after ratio). It can be shown that a number is rational if its decimal representation is repeating or terminating.

(*) At present, there is no single universally accepted notation or phrasing for repeating decimals.